Polishing-machine.



' PATENTED JUNE 4, 190?.

E. KRfTGER. POLISHING MACHINE.

APPLIOATION FILED MAR. 20 1906.

2 SHEETS-SHEET 1.

No. 855,544. PATENTED JUNE 4, 1907.

E. KBfiGER. POLISHING MAGHINE.

APPLICATION FILED MAR. 20, 1906.

2 SHEETSSHEET 2.

1am @WW ERNST KRUGER, or BERLIN, GERMANY.

PousHme-MAoi-saie.

Specification of Letters Patent.

Patented June 4, 1907.

Application filed March 20, 1906. Serial No. 307,006.

To all whom it may concern:

Be it known that I, ERNST KRI'JGER, a subject of the King of Prussia,and a resident of Gormannstrasse 89, Berlin, Germany, have invented anew and useful Improved Polishing-Machine, of which the following is thespecification. i

This invention relates to and has for its object a machine forautomatically polishing round objects, especially round metal pases, inuninterrupted succession, by means of several polishing disks or thelike, which machine, in contradistinction to well-known polishingmachines which likewise feed, polish'and throw off the piece of workautomatically, has as its chief feature the arrangement that the pieceof work is automatically pushed bythe feeder on a rotating mandrel whichis mounted between two or more polishing disks revolving at high speedand which is expanded or spread out by an automatically operatinggripping device like a lathe-chuck, so that said mandrel holds the pieceof work fast while it is being polished and indeed until the grippingdevice is automatically. loosened again and the finished polished objectis thrown off by a pushing device. Meanwhile the feeder has alreadyagain taken hold of a new piece of work and the cycle of operation isrepeated. I

One embodiment of a machine according to the present invention is shownin the acconip anying drawings, in which Figure 1 is a side elevation ofthe machine, the upper portion of the feeding shaft being broken off.Fig. 2 is a plan, and Fig. 3 is a side view of the machine partly insection, the feeding shaft being broken off. Fig. 4 shows the feedingdevice in section.

r The following description of the cycle of operations ex lains at thesametime the construction of t e machine.

As shown in Fig. 1, the objects to be polished, cylindrical metal cases.d for example, are placed oneover another in the feeding-shaft c whichis adjustably fastened to the holder 1) means-of screws a. The horiezontally bent part b (Fig. 3) of the holder 1) has .a trapeziform crosssection (Fig. 4). The feeder f is guided on it in a straight line bymeans of a dovetail-shaped guide'e. A U-shaped spring g is fastenedimmediately under thefeeding-shaft c to the holder b, the ends of saidspring being provided with wedge-shaped. noses i pointing inward on d.their axles at a speed of about 2500 revoluwhich. the lowest piece ofwork d generally rests. Now as soon as the feeder f which has the formof a U (Fig. 4) is moved back by means of a rod Z which is operated byhe two-armed lever is (Fig. 2) moved by a cam t mounted on the shaft pout of the position shown in Fig. 2 into the position according to Fig.3, the rear edges of the feeder f strike upon both the wedge-shapednoses i and thereby press the U-shaped spring g so much apart that thelowest piece of work (1 in .the feeder f can fall into the said feeder.The next piece of work is then caught by the noses i of the spring 9 andis held until its turn comes at the next operation' Now the feederf goesforward on its guide 1 with the piece of work (1 lying in it and pushesthe iece of Work baid mandrel m consists of several parts which canbeexpanded or spread apart in a similar manner to the parts of anexpanding chuck. For this purpose a rod 0 pointed at its front end isarranged dis laceably in the hollow sh aft nof the mandre m, which rodis at a suitable moment pushed forward by a cam g arranged on the shaft10 by means of a lever 1" and thereby ex ands the mandrel m so thatthesame holds ast the piece of work (Z pushed on to it. Now the lever is isturned back again by the cam 25 on the shaft 1) and consequently the rod1 -moves the feeder f back again into the position according to Fig. 3.-At this-moment-the cams ac a; which are'likewise on theshafts p, 1),cause the bearings c of the polishing-disk shafts w to approach sonearto one another, until both the polishing disks y touch the piece ofwork As the polishing. disks revolve round tions per minute and for thispurpose are driven by means of belting or the like as Fig. 1 indicatesby dotted lines, and as the mandrel shaft 'n, revolves however onlyabout 5 or 6 times round its axle in the same time, the polishing disksy revolve about 500 times during one revolution of the piece of work.But as there are two polishing disks d on to the mandrelm (Fig. 3).

and consequently each works on half the circumference of the piece ofwork, half a revolution of the piece of work suffices in order tobrightly polish its periphery. In addition to this, the axles w may alsobe vmounted in a well-known manner, so that they. can be movedsimultaneously to and fro in the direction of their axles by for examplecams which can be likewise arranged von shaft p or F, in such a way thatevery polnt of the circumference of the piece of work d is touched'manytimes by the polish--' ing disk. Now, as soon as the piece of work (Zhas finished revolving half a revolution, the cam g on the shaft 22pulls the expanding rod back again by means of'the'lever r. Consequentlythe parts'of the mandrel m are cam Z.

no longer expanded. At the same time a cam 2 (Figs. 2 & 3) arranged onthe shaft p releases a spring 13 by means of alever 12; the spring haspreviously been compressed by a mud or sleeve 14 which is displaceableon the shaft 92 of the mandrel and is connect ed with the lever 12, thecam 2 moving the lower arm of the lever12 to the left as in Fig. 3. Butas soon as the expanding rod 9 has released the mandrel m, the roller ofthe lever 12 has reached the highest point of the 'Now on the latterbeing rotated further, the spring 13 suddenly drives the sleevel4forward and this sleeve pushes the pieceof work (Z which is now looseon the mandrel off the same so that it falls into a receptacleplacedunderneath to receive it. Hereupon the expanding-rod 0 is pulledbackonce more by its lever r, so that the mandrel m is fully contracted andthe feederf is able to place a new piece of work on it., The cycle of oerations repeats itself.

Both tie shafts,' p, p suitably receive their drive from a transverseshaft 16 by Thisjis provided means of the worm-gear 15. with aspeed-pulley 17 which again, on its part, may be driven fromcountershafting by rope or belt drive or the like. The cams 9c being inengagement with the cross bars 18,

so that said cross bars approach one another or're'treat from oneanother if the screwed spindle 19 is rotated: In this. way the cams xwhich drive the shafts w of the polishing disks positively to and fro,can be gradually placed back in correspondence with the wear of thepolishing disks, that is, they can at an y time be brought closertogether.

1 The mandrel shaft n suitahly receives its drive from one of the twoshafts 2), p as these have approximately the same-speed of rotation. Forthis purpose, the bevelv wheel gear 20 (Figs. 1 & 2) may either beemployed directly for driving the shaft n, or, where this is notfeasible onaccount of want of space, may be so arranged'that it in thefirst place drives a chain-wheel, 2.1 Fig. 3) which then rotates the,shaft n by means of chain '22.' The shaftn may also be driven from aframe, means for iolding a plurality of articles to be polished, arevoluble expansible mandrel mounted on the frame, means for feedingthearticles on" to saidmandrel, means for expanding said mandrelinto'operative engagement with the article fed thereon and formaintaining the mandrel in its expanded condition during the operationof polishing, and for releasing the same thereafter, means for polishingthe article, and means for throwing the article off the mandrel afterthe release of said operative engagement.

2. An automatic polishing machine of the type described, comprising incombination a frame, means for holding a plurality of articles to bepolished, arevoluble expansible mandrel mounted on the frame, means forfeeding the articles on to said mandrel, means for expanding saidmandrel into operative engagement with the'article" fed thereon and formaintainingthe mandrel in its expanded condition during the operation ofpolishing, and for releasing the same thereafter, a Pinrality ofrevoluble 'olishing disks arranged aroundsaid mandre ,means for movingsaid polishing disks upagainst the artlcle on the mandrel and forwithdrawing the same there'- 4 from, and means for throwing the articleoff the'mandr'el after the release of said operative engagement. 7

3. An automatic polishing machine of the type described, comprising-incombination a frame, means for holding; a plurality of articles, to bepolished, a mandrel mounted on the frame, means' for feeding thearticles on to'said mandrel, means for operatively interconnecting themandrel and the article fed thereon, a plurality of revoluble polishingdisks arranged around said mandrel, shafts to carrying said disks oneshaft on each side Of and parallel to the-mandrel, rectilineally guidedslides 12' supporting said shaft, pins attached to said slides, camsmengaging said pins andadapted to reciprocate said slides, rectilineallyguided cross-bars 18 revolubly supporting said cams, revoluble shaftsgp, p having feathers in sliding engagement with said cams for rotatingsaid cams, aspindle1'9 having right-handed and left-handed screws,

ICC

one screw revolubly engaging one cross-bar and the other screw the othercross-bar, and means for rotating the spindle 19 by handy for thepurpose of adjusting said cams on said shaft p, p and so adjusting-saidpolish ing disks with regard tothe article on the mandrel, means fordisengaging the operative connection between the mandrel and article,and means for throwing the article said operative connection.

" type described, comprising in combination a means for 4 releasing the.same.

' with the mandrel means for disengaging the v on to said in.

v or maintaining the mandrel in its expanded T condi tion during theoperation for releasing the same thereafter, means for feeder into i offthe mandrel after the disengagement of" frame, a substantiallyvertical'feeding-shaft.

v for holding a plurality of articles'to be polpohshing machine of theished, a mandrel mounted on the frame, a feeder f having a slide 6, aguide 6 for said slide arranged between the base of s ing shaft and saidmandrel, means for'recip'rocating said feeder to and fro on said guide,a U-shaped s ring 9 immediately under the feeding-sha t said springhaving wedgeshaped noses n'ormallyadapted to support the lowermostarticle in said shaft, said sprin being arranged in the path ofthe'feeder f whereby on the return of the feeder into its and forreleasin the'same thereafter, means position under said shaft saidfeeder engages for driving sai rod into said mandrel to the springand-releases said article whereupon expand the same and for withdrawingsaid the latter drops into the feeder and is subsethe article, and Iquently fed on to said mandrel, means for o eratively interconnectingthe mandrel and e article fed thereon, means for polishing the articleWhile operatively connected with the mandrel, means for disengaging theoperative connection between the mandrel and article, and meansforthrowing the article off i the mandrel afterthe disengagement of thesaid-operative connection.

0 An automatic polishing machine of the type described, comprising incombination a frame, a substantially vertical feeding-shaft for holdinga plurality of articles .to be ished,a revoluble expansible mandrelmounted on the frame, a feeder f having a slide 6, a guide 6 for saidslide arranged between the base of said feeding-shaft and said mandrel,means for reciprocating said feeder to and fro on said guide, means'forreleasing the lowermost article from the feeding-shaft on the return ofthe feeder into its position under said feeding-shaft whereby saidarticle drops into the feeder and is fed on to said mandrel, means forexpanding said mandrel into operative engagement with the article fedthereon and for maintaining the mandrel in its ex. panded conditionduring the operation of 01- ishing, and. for releasing the same thereater, means for olishin the article, and means for I throwing it earti'cfe off the mandrel after release of said operative engagement.

9. ,An automatic polishing machine of the type described, comprising incombination a frame, a substantially vertical feeding-shaft for holdinga plurality of articles to be polished, a revoluble mandrel mounted onthe frame, a feeder f having a slide 6, a guide I) for said slidearranged between the base of said feeding-shaft and said mandrel, meansor reciprocating guide, means for releasing the lowermost article fromthe feeding shaft on the return of the feeder into its position undersaid feeding-- said article drops into the d on to said mandrel, meansfor o eratively interconnecting the mandrel and tiie article fedthereon, a plurality of revoluble polishing disks arranged around saidmandrel, means for moving -said polishing 4. An automatic ame', meansfor holding a plurality of arti- I cles to be polished, arevolubleexpansible I mandrel, a hollow revoluble shaft supporting said mandrel,means for feeding the articles mandrel, a rod in said hollow shaft forexpanding said mandrel into operative engagement with the article fedthereon and tion during the operation of polishing,

. 5. An automatic polishingmach-ine of the type described,,compri'singincombination a frame, means for holding a lurality of articles to be'olished, a revo uble expansible' mandrel, a ollow revoluble shaftsupporting said mandrel, means for feeding the articles on to saidmandrel, means for expanding said mandrel into operative "engagement.with the artidle fed thereonand'for maintaining the mandrel in itsexpanded condiof polishing, and

polishing the article, and means for throwing the article off themandrel after the release of said operative engagement, said meansconsisting of a sleeve on the mandrel shaft, a spring acting onsaidsleeve and tending to press it against the article to be polished andperiodically moving said sleeve against the force exerted by the springand polishing machine of the type described, comprising in combination aame, a substantially vertical feeding-shaft for heiding'a plurality ofarticles to be polished, a mandrel mounted on the frame, a feeder fhavin a slide e, a guide '6 for said slide arrangedietween the base ofsaid feeding-shaft and said mandrel, means for reqip rocating saidfeeder to and fro 6. An automatic on said guide, means for releasing thelowermost articlev from the feeding-shaft on the return of the tsposition under said feeding aid article drops into the feederand is fedon to said mandrel, means for o eratively interconnecting the mandreland t e article fed thereon, means for polishing the article Whileoperatively connected I shaft whereby s o erative connection between themandrel and article, and means for throwing the article off themandrelafter the disengagement of said operative connection.

7. An automatic polishing. machine of the I type described, comprisingin combinationa pol- ITO

the

&

disks up against the article on the mandrel and for Withdrawing the sametherefrom, means for disengaging the operative connection betweenthemandrel and article, and

5 means for throwing the aiticie, off the mandl el after thedisengagement of said operatwe connection.

In testimony whereof I name to this specification in thepresence of thetwo subscrlbing witnesses. u v

JRNST KRUGER.

\Vitnesses:

\VOLDEMAR HAUPT, HEX RY HASPER.

have. signed my

